When milk is churned, cream gets separated due to

  • [AIPMT 1991]
  • A

    gravitational force

  • B

    fricitional force

  • C

    centrifugal force

  • D

    centripetal force

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  • [IIT 2009]

The ends of a rope are held by two men who pulls on it with equal and opposite forces of  magnitude $F$ each. Then the tension in the rope is